niggliite

例句：

1. 1. The coal mine was filled with the black, gritty substance.
   煤矿里充满了黑色的、颗粒状的物质。
2. 2.The miners had to remove the niggliite from the tunnels.
   矿工们不得不从隧道中清除煤渣。
3. 3.The niggliite is a byproduct of coal mining and can be used for various purposes.
   煤渣是煤炭开采的副产品，可以用于各种用途。